Camera.hh

/**********************************************************************
 * blaRAY -- photon mapper/raytracer
 * (C) 2008 by Tomasz bla Fortuna <bla@thera.be>, <bla@af.gliwice.pl>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * See Docs/LICENSE
 *********************/

#ifndef _CAMERA_H_
#define _CAMERA_H_

#include <cmath>

#include "General/Types.hh"
#include "Math/Vector.hh"
#include "Render/Ray.hh"

namespace World {

        class Camera {
        protected:
                Double FOV;

                Math::Vector Pos;

                Math::Vector Dir;

                Math::Vector Top;

        public:
                class View {
                        friend class Camera;

                protected:
                        const Math::Vector &Pos;

                        const Math::Vector &Dir;

                        const Math::Vector XVect;

                        const Math::Vector YVect;

                        Double XResHalf, YResHalf;
                        View(Int XRes, Int YRes,
                             const Math::Vector &Pos, const Math::Vector &Dir,
                             const Math::Vector XVect, const Math::Vector YVect)
                                : Pos(Pos), Dir(Dir), XVect(XVect), YVect(YVect),
                                  XResHalf(XRes/2.0), YResHalf(YRes/2.0)
                        {
                        }
                public:
                        Render::Ray At(Int x, Int y) const;
                };

                static inline Double DegreeToFOV(Double Degree)
                {
                        return (double)Degree / 360.0 * 2 * M_PI;
                }

                Camera(const Math::Vector &Pos = Math::Vector(0.0, 1.0, -1.0),
                       const Math::Vector &Dir = Math::Vector(0.0, 0.0, 1.0),
                       Double FOV = DegreeToFOV(45.0),
                       Bool AutoTop = true,
                       const Math::Vector &Top = Math::Vector(0.0, 1.0, 0.0));

                View CreateView(Int XRes, Int YRes) const;

                friend std::ostream &operator<<(std::ostream &os, const Camera &C);
        };
};

#endif

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